I would make a FPS game with all the guns in the world with also Campaign missions. Also I might make different modes and Multi player online with a really good server. Also I might make a mode where it is Futuristic and like Halo 3.
All suggestions welcome and please no spam (e.g. pie)
I would make a game like uncharted or ratchet and clank, there has to be some action but the story must be good and it must be good looking! i would add trophees because that makes a game more fun and also i would mae a multi player online mode, because that's always nice:P Ofcourse i would also add settings like easy/normal/hard/dying:P